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JUST IN: Antibody research indicates coronavirus may be far more widespread than known. abcn.ws/3ajgWcO

MORE: The first large-scale community test of 3,300 people in Santa Clara County found that 2.5 to 4.2% of those tested were positive for antibodies—a number suggesting a far higher past infection rate than the official count. abcn.ws/3ajgWcO

Based on initial data, researchers estimate the range of people who may have had the virus to be between 48,000 and 81,000 in the county of 2 million—as opposed to the approximately 1,000 in the county's official tally at the time the samples were taken. abcn.ws/3ajgWcO

JUST IN: Travel data of passengers arriving in the U.S. from China during the critical period in December, January and February shows a stunning 759,493 people entered the U.S. abcn.ws/344ZVlb

MORE: Those travelers from China included more than 228,000 Americans returning home and hundreds of thousands of Chinese nationals arriving for business, academics, tourism or to visit family. abcn.ws/344ZVlb

BREAKING: NY Gov. Andrew Cuomo announces containment zone around New Rochelle, lasting until 3/25; National Guard to be deployed to assist in food delivery, cleaning.

"This is the single greatest public health challenge we have in the state right now." abcn.ws/33blccv Sorry, your browser doesn't support embedded videos

BREAKING: A one-mile containment area has been set up in New Rochelle, New York, due to the cluster of coronavirus infections that have taken place in the city, New York Gov. Andrew Cuomo announces. abcn.ws/2TCnNJt

MORE: All schools in the area will close, and large gatherings have been canceled.

People can go in and out of the containment zone, and small businesses can remain open, Cuomo says. abcn.ws/2TCnNJt

BREAKING: Multiple missiles have been launched into Iraq from Iran targeting American bases. abcn.ws/2N5yxfC

MORE: A U.S. official confirms to @ABC News that ballistic missiles have been fired from inside Iran at multiple U.S. military facilities inside Iraq.

The facilities include Erbil in northern Iraq and Al Asad Air Base in western Iraq, the official said. abcn.ws/2FqnwBz

NEW: White House Press Secretary Stephanie Grisham: “We are aware of the reports of attacks on US facilities in Iraq. The President has been briefed and is monitoring the situation closely and consulting with his national security team.” abcn.ws/39KwdV8

MORE: "In an unprecedented level of coordination, the U.S. government is working with all 50 states and U.S. territories, local officials, and private sector partners to identify threats, broadly share information, and protect the democratic process," the agencies say.

MORE: "While at this time we have no evidence of a compromise or disruption to election infrastructure that would enable adversaries to prevent voting, change vote counts or disrupt the ability to tally votes, we continue to vigilantly monitor any threats to U.S. elections."

US Attorney Geoffrey Berman: The defendants "sought political influence not only to advance their own financial interests, but to advance the political interest of...a Ukrainian government official who sought the dismissal of the US ambassador to Ukraine." abcn.ws/327P4Fi Sorry, your browser doesn't support embedded videos

The Trump administration plans to transfer federal land into military control in order to continue construction of the wall along the southern border. abcn.ws/30qWy4z

The Department of Interior, which controls public land around the country, announced that 560 acres of federal land will be transferred to the U.S. Army for the construction of 70 acres of border wall. abcn.ws/2AvvLd0

All of the land involved is part of an area called the "Roosevelt Reservation," which was designated by Pres. Theodore Roosevelt in 1907 to make all land 60 feet around the border between the U.S. and Mexico public to serve as a barrier against smuggling. abcn.ws/2AvvLd0

BREAKING: House Democrats send their long-anticipated request to the Treasury Department for Pres. Trump’s tax returns, the opening salvo in what could prove an explosive battle between Democrats and the Trump administration. abcn.ws/2K4CGBH

MORE: House Democrats sent a request to the IRS for Trump’s tax returns.

They have said they would use Trump's tax returns to inform investigations into allegations of corruption and wrongdoing in the administration and the president’s family business. abcn.ws/2K6iLC8

Pres. Trump says he “would not be inclined” to comply with new Congressional request for six years of his tax returns, citing an ongoing audit as the reason. abcn.ws/2K3f9kl Sorry, your browser doesn't support embedded videos

NATO Secretary-General Jens Stoltenberg Jens Stoltenberg: "We have experienced an unprecedented period of peace. So the NATO alliance is not only the longest-lasting alliance in history, it is the most successful alliance in history." abcn.ws/2K3A8DM Sorry, your browser doesn't support embedded videos

BREAKING: Pres. Trump: "We're going to be issuing an emergency order of prohibition to ground all flights of the 737 MAX 8 and the 737 MAX 9, and planes associated with that line." abcn.ws/2TSmg33 Sorry, your browser doesn't support embedded videos

MORE: The decision follows days of mounting pressure from other countries that left the U.S. as one of the last to make the call after a deadly crash in Ethiopia. abcn.ws/2TSmg33

NEW: American Airlines statement: "We appreciate the FAA’s partnership...Our teams will be working to rebook customers as quickly as possible, and we apologize for any inconvenience." abcn.ws/2TSmg33

Chicago Police Superintendent Eddie Johnson speaks on Jussie Smollett arrest: "Chicago hosts one of the largest pride parades in the world, and we're proud of that as a police department and also as a city." abcn.ws/2ST8mhk

BREAKING: George Herbert Walker Bush, the 41st president of the United States, has died at age 94. abcn.ws/2E7p98z

BREAKING: Statement from George W. Bush on passing of his father: "Our dear Dad has died. George H. W. Bush was a man of the highest character and the best dad a son or daughter could ask for." abcn.ws/2E7p98z

NEW: George P. Bush: "He was more than a great man; he was a good man...Gampy, we love you and we will miss you. But we will never forget you." abcn.ws/2E7p98z

DHS Sec. Nielsen issues statement on San Ysidro Port of Entry closure: “As I have continually stated, DHS will not tolerate this type of lawlessness and will not hesitate to shut down ports of entry for security and public safety reasons.” abcn.ws/2RbF3Bv

"Warning: Due to the current situation, the San Ysidro Port of Entry is now closed."

U.S. border officials shut down the port of entry between San Diego and Tijuana as thousands of Central American migrants wait in Mexico to apply for asylum in the U.S. abcn.ws/2DYaj4a Sorry, your browser doesn't support embedded videos

DEVELOPING: People are being warned to avoid the area of an active shooting in Pittsburgh, Pennsylvania, according to Pittsburgh Public Safety. ATF is currently responding to the scene. abcn.ws/2O8dh6R

Former Pres. Obama: "The consequences of anybody sitting out of this election are profound...The character of our country's on the ballot." abcn.ws/2hFejwL Sorry, your browser doesn't support embedded videos

Former Pres. Obama: "The story of American became the story of progress because we got out there and did the work." abcn.ws/2hFejwL Sorry, your browser doesn't support embedded videos

Former Pres. Obama: "What we have not seen before, in our recent public life at least, is politicians just blatantly, repeatedly, baldly, shamelessly lying." abcn.ws/2hFejwL Sorry, your browser doesn't support embedded videos

JUST IN: Disapproval of Pres. Trump is at a new high, support for the Mueller probe is broad, and half of Americans favor Congress initiating impeachment proceedings against the president, new @ABC News/WaPo poll finds. abcn.ws/2PQsuv8

60% disapprove of Pres. Trump, numerically the highest of his presidency; 53% disapprove strongly, the first time more than half have said so in an @ABC News/WaPo poll. abcn.ws/2PQsuv8

JUST IN: 49% in new @ABC News/WaPo poll support Congress initiating impeachment proceedings against Pres. Trump; support rises to 57% among women. abcn.ws/2PQsuv8